CN-117153304-B - Microscopic scale projectile-barrel impact behavior modeling method

CN117153304BCN 117153304 BCN117153304 BCN 117153304BCN-117153304-B

Abstract

The invention belongs to the field of barrel life research, and particularly discloses a microscopic scale projectile-barrel impact behavior modeling method which comprises the steps of screening atomic components and atomic mass fractions of a projectile-barrel material; determining the potential energy well depth and the zero potential energy atom distance of each component atom, determining the function of the two body potential energy between the atoms of the pellet-barrel material, establishing a pellet-barrel material polycrystalline structure, establishing a pellet-barrel material crystal model, and solving the microscopic scale pellet-barrel impact behavior by a momentum mirror method. Compared with the prior art, the invention establishes the model of the barrel material of the projectile-barrel impact behavior from the microscopic modeling angle, perfects the function of the two body potential energy among atoms in the projectile-barrel material, links the molecular dynamics with the impact dynamics, and lays a foundation for the mechanism research of the barrel bore plastic damage.

Inventors

LI SHULI
WANG LIQUN
GUO CHENGYUAN
YANG GUOLAI

Assignees

南京理工大学

Dates

Publication Date: 20260505
Application Date: 20230829

Claims (5)

1. A microscopic scale projectile-barrel impact behavior modeling method is characterized by comprising the following specific steps: Step 1, discriminating the atomic components and atomic mass fractions of the projectile-barrel material; Step2, determining the depth of potential energy wells among atoms of each component and the zero potential energy atomic distance; Step 3, determining a function of the potential energy of the interatomic body potential of the projectile-barrel material; step 4, establishing a pellet-barrel material polycrystalline structure model based on polycrystalline modeling software; the method comprises the following specific steps: Step 4.1, setting the size of a computing box and the number of grains; step 4.2, fe element with highest atomic mass fraction of the projectile-barrel material is used for establishing a unit cell of the Fe element, so as to obtain crystal grains of the Fe element; step 4.3, arranging crystal grains at random positions of the computing box, dividing crystal boundaries by considering collision among crystal grains with different crystal directions, and combining a plurality of crystal grains with different crystal directions to form a new crystal structure by combining the crystal boundaries formed by the crystal grains with the collision; Step 4.4, replacing part of atoms in the polycrystalline model of the iron element in the step 4.2 by other atoms in the pellet-barrel material source based on atomic components and atomic component mass fractions, thereby obtaining a complete composite material pellet-barrel polycrystalline model; Step 5, establishing a pellet-barrel material crystal model based on the polycrystalline structure model and the potential energy function; the method comprises the following specific steps: Setting boundary conditions, atom types, time steps and unit systems of a calculation box, introducing a pellet-barrel polycrystalline model, and calibrating and checking the relative atomic mass of atoms of each element; Step 5.2, carrying out region division on the established polycrystalline model according to the need, wherein the region division cannot be overlapped and the region name needs to be unique; Setting the zero potential energy atomic distance of atoms in all areas and the potential energy well depth according to the two-body potential energy function, and further establishing a preliminary crystal model of the projectile-barrel material; step 5.4, performing energy minimization treatment on the initially established pellet-barrel material crystal model, and performing relaxation analysis; Step 5.5, re-fitting the body potential energy function, and repeating the steps 1-4 until a pellet-barrel material crystal model meeting the expectations is established; and 6, solving microscopic scale projectile-barrel impact behaviors through a momentum mirror method.
2. The microscopic scale projectile-barrel impact behavior modeling method of claim 1, wherein the potential energy well depth and the zero potential energy atomic distance determining method in the step 2 are that fitting is carried out according to potential energy functions of existing elements to obtain the zero potential energy atomic distance Potential energy well depth The approximate fitting formula is: ; In the middle of , The zero potential energy atomic distance of two different atoms A and B is obtained by consulting literature; , the potential energy well depths for two different atoms a and B, respectively.
3. The microscopic scale shot-to-barrel impact behavior modeling method of claim 2, wherein the two distances in step 3 are The interaction kinetic energy E function between neutral atoms is: ; Wherein l is a neutral atomic distance and l c is an interatomic cutoff radius.
4. The microscopic scale shot-barrel impact behavior modeling method according to claim 1, wherein in step 6, the shot and barrel material crystal model is a simplified model built according to a "momentum mirror" method, wherein the impact body corresponds to the shot material crystal structure, the load receiver corresponds to the barrel material crystal structure, and the black line frame corresponds to the "calculation box".
5. The method of modeling microscopic scale pellet-barrel impact behavior according to claim 4, wherein the pellet barrel material is PCrNi3MoVA.

Description

Microscopic scale projectile-barrel impact behavior modeling method Technical Field The invention belongs to the field of barrel cycle impact fatigue life research, and particularly relates to a microscopic scale projectile-barrel impact behavior modeling method. Background The improvement of the service life of the barrel weapon is always an important direction of weapon research, and although the main stream methods of hydraulic self-tightening, gradient chromium plating and the like are slightly effective at present, the improvement of the service life of the barrel is far from ideal due to lack of research on impact plastic damage mechanisms of barrel bores. Due to the expertise of the barrel weapon, the barrel weapon is more difficult to perform discipline cross fusion, so that the study of the barrel bore impact plastic damage behavior still stays in an empirical summary based on experimental data, and the empirical summary is currently the root cause for restricting the service life of the barrel weapon to be improved. At present, the shot-barrel impact behavior modeling mainly comprises two methods, namely macroscopic scale surface-surface impact behavior modeling based on Herzt, lankarani-NIKRAVESH contact theory and mesoscopic crystal plasticity finite element impact behavior modeling based on experimental data. The former is suitable for macroscopic scale, the latter is suitable for macroscopic and mesoscale, and the two are still in the nature of a model of unique image, and the mechanistic problem of impact behavior cannot be accurately described. Disclosure of Invention The invention aims to provide a microscopic scale projectile-barrel impact behavior modeling method to realize the combination of molecular dynamics and impact dynamics, lay a foundation for the mechanical research of barrel bore plastic damage, promote discipline fusion and inject new vitality into the field of artillery. The technical scheme of the invention is that the microscopic scale projectile-barrel impact behavior modeling method comprises the following specific steps: Step 1, discriminating the atomic components and atomic mass fractions of the projectile-barrel material; Step2, determining the depth of potential energy wells among atoms of each component and the zero potential energy atomic distance; step 3, determining a function of the potential energy of the interatomic body potential of the projectile-barrel material; Step 4, establishing a pellet-barrel material polycrystalline structure based on polycrystalline modeling software; Step 5, establishing a pellet-barrel material crystal model based on the polycrystalline structure model and the two-body potential energy function; and 6, solving microscopic scale projectile-barrel impact behaviors through a momentum mirror method. Compared with the prior art, the invention has the remarkable advantages that: (1) The microscopic scale pellet-barrel impact behavior modeling method established by the invention focuses on the pellet-barrel impact behavior from the microscopic modeling angle, and lays a foundation for the rational research of the pellet impact barrel. (2) According to the microscopic scale pellet-barrel impact behavior modeling method established by the invention, the inter-atomic two-body potential energy function in the pellet-barrel material (PCrNi 3 MoVA) is calculated and perfected based on DFT (density functional theory), so that the accuracy of a microscopic scale pellet-barrel impact behavior model is ensured. (3) The microscopic scale projectile-barrel impact behavior modeling method established by the invention relates molecular dynamics to impact dynamics, lays a foundation for the mechanism research of barrel bore plastic damage, and has wide engineering application prospect. Drawings FIG. 1 is a modeling strategy for a polycrystalline structure of a shot-barrel material; Fig. 2 is a pellet-barrel material polycrystalline structure, fig. 2 (a) is an atomic composition in the polycrystalline structure, and fig. 2 (b) is a grain boundary in the polycrystalline structure; FIG. 3 is a pellet-barrel material crystal model modeling strategy based on polycrystalline structure and potential energy function; FIG. 4 is a view showing a crystal model in a relaxed state, FIG. 4 (a) is a view showing a crystal model in a relaxed state after initial modeling, and FIG. 4 (b) is a view showing a crystal model in a relaxed state after adjustment of a potential function; Fig. 5 shows the tensile stress-strain law of the microscopic crystal model of the pellet-barrel material. FIG. 6 is a "momentum mirror" method for solving for microscopic scale shot-barrel impact behavior. Detailed Description The invention is further described with reference to the drawings and specific embodiments. The atomic potential energy functions of the microscopic-scale projectile-barrel material are determined, and the specific steps are as follows: step 1, screening atomic componen